Counterbalancing elevator-door.



A. TOL?. COUNTEEBALANUING BLEVATOR DORS'n APPLIOATION FILED MM 1s, 1999.

Patented .my 9,1999.

2 SHEETS-SHEET 1.

A. TLF. GOUNTERBALANGING ELEVATGR DOORS.

APHJUATION FILED MAY 13, 1008.

Patented July 6, 1909. 2 MEETS-SHEET 2.

Zay

illustrated on Figs. 1 to 5, connection between these levers and the door sections being by means. of the links and 23, attached to the ends of the levers. The door sections 35, 37, are su ported by means of links 40, 41, respective y', attached to the levers intermediate of their ends, thereby giving these door sections a less range of movement than the sections 34, 36, so that when the .door is opened the innersections slide alongside the outer sections. In 'this con-I struction the same counterbalancing action hereinbeforev pointed out, the further ad-v is secured with consequent ease of operation.

The lever movement herein shown and de-r scribed has, in addition to the advantages vantage of avoiding violent action in closing.

` lIhe initial movement in opening is com aratively slow because of the positlon of t e levers, and in closing the final movement is correspondingly retarded, the doors making a gentle contact and thus avoidingistrain upon the parts. Furthermore, the various pivots employed for Athe levers and links may be made much stronger than it is possible to utilize where chains are relied upon, with- .out makin the latter unduly cumbersome.

While I iave shown in Fi s. 6 and 7 four door sections, it is obvious t at the number 'may be varied, the invention being equally applicable to a situation in which any number of sections are employed. It not infrequently occurs that it is found desirable to make doors of this'class in three sections, two of them moving in one direction and one in the other, and 1t will be seen that, referring to Fig. 6, either the lower section 35 or the upper section 37 may be dispensed with, it becoming necessary only to make the remainingsingle section sufficiently heavy to counterbalance the two sections moving inthe op osite direction, andthis will usually result rom the larger size of the single section. 'i

I claim as myl invention,-

1. In combination, a pai of oppositelyopening sliding doors, Ways or the doors, a pair of levers pivoted to the ways and each connected. to one ofthe doors, a lmk connecting the levers and being attached thereto at opposite sides of their ivots, a handle bar attached to one of the evers, and a spring latch'attached to the handle bar and engaging one of the levers.

2. In combination, a pairpf oppositely moving sliding doors,one thereof being comosed of two sections, Ways for the doors, a ever pivoted to one of the Wa s, a link connecting the lever to one ofthe cors, a secondlever pivoted to one of the Ways, links convnectin such lever to thetwo sections of the other oor and being attached to the lever at differing distances from its pivot.

'3. In combination, a sliding door comprising a plurality of sections arranged in oppositely-moving sets,'ways for the several sections, levers pivoted lto the ways, and. links connectin each lever to a plurality of sections and ei'ng attachedto the levers at differin distances from their pivots.

4. n combination, a slidmgdoor comprising a lurality of sections, ways for the sections, evers pivoted to the ways, and links connecting each lever`to a plurality of sections and being attached to the levers at different distances from their pivots.

5. In combination, a slid ng door comprising two oppositely-moving glroups of sections, ways for the sections, evers pivoted to the ways, a link connectin the levers and attached thereto, respectivey, at opposite sides of theirr pivots, and links connectin each lever with the several sections of one o the groups, such links being attached to the levers at different distances from their pivots.

AXEL rohr.I

Witnesses: l

LoUIs K. GrLLsoN, E. M. KLATCHER.. 

